<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>打印金字塔</title>
	</head>
	<body>
		<script>
			var l=prompt("请输入行数：")
			/*document.write('<p align="center">');
			for (var i=1;i<=l;i++) {
                   for(var j=1;j<=2*i-1;j++){
                       document.write("*");
                   }
                   document.write("<br/>");
            }*/
			
			
			for (var i=1;i<=l;i++) {
				for (var k = 1; k <= l-i; k++) {
					document.write("&nbsp");
				}
                   for(var j=1;j<=2*i-1;j++){
                       document.write("*");
                   }
                   document.write("<br/>");
            }
		</script>
	</body>
</html>
